Apparatus for moving derricks and the like



G. e. PRENDERGAW APPARATUS FOR MOVING DERRICKS AND THE LIKE Aug. 114,m3.

Filed may 13, 1921 3 Sham-sheaf; 1

Aug 1141', 11923. EAfiQ-EEZ G. as PRENDEZRGAST APPARATUS FOR MOVINGDERRICKS AND THE LIKE Filed May 13 1921 3 Sheets-Sheet 2 Aug. 114,11923.

GIG. PRENDERGAST APPARATUS FOR MOVING DERRICKS AND THE LIKE File May 131921 3 Sheets-Sheet 5 Patented Aug. Ml, 1923.,

GEORGE Gr. PEENDERGAST, '31 ST. LOUIS,

APPARATUS FOR MOVENG Application filed May 13,

ing is a specification cont ing a full, clear. and exact description,resence being had to the accompanying drawings, forming a part hereof.

My invention relates to improvements in apparatus for moving derricksand the like,

primary object pair of frame work of timbottom so that the y and has forits skids constructed of a bers and closed at their same will not sinkinto soft soil.

A further object is to construct a pair of skids on which a travelingderrick is mounted, the skids being so arranged as to be moved as thework progresses.

- In the drawings, 7

Fig. 1 is a side elevation of my device, showing the manner of mountingthe derrick thereon.

Fig. 2 a top plan view of the same.

3 a top plan view of one of the skids before the supporting track islaid thereon.

Fig. i is a bottom plan view of the same.

Fig. 5 a side elevation of one of the acks made use of to relieve thepressure on the skids while the same is being moved. parts, thereofbeing broken away and in section.

In the construction of my device I em-. ploy pair of skids 6 and 7.These skids are constructed of heavy timbers and comprise a centraltimber S and side timbers 9. These timbers are bolted together asindicated by the bolts 10, so that the skid can. be built of any desiredpractical length. The timbers 8 and 9 are spaced apart by means ofblocks 11. The whole being secured together by means of bolts 12 whichpass through the side timbers 9 and central timher 8 and the blocks 11.Each end of the timbers as well as the blocks adjacent thereto isinclined as at 13. When the frame has thus been assembled, the entirebotton'i closed by means of boards 14, thus making 0 each skid resemblea flat boat. This construction prevents the skids from sinking); intosoft soil and the width of the skids can be regulated according to theclass of ground on which they are to be used. Placed over the timbers Sand 9 are cross-bars or ties 15 and on these ties are secured rails 16.These IVEISSOUBI.

DEBEICKS AND THE LIKE.

1921. Serial No. 469,387.

rails act as a runway for wheelsl? which are mounted on the underside ofa platform 18. This platform may be constructed of any desired material,but is preferably built up of steel. Secured to one end of the platform18 is an frame 19 which is braced by means of the stiff legs 20.Pivotally mounted between the legs of the A frame is a boom 21. Thisboom is adapted to be raised and lowered by means of cables 22. The boomis also provided with hoisting cables which hoist the load. In thepresent in stance as shown in the drawing, this load is the cl am shellbucket 24, although an ordinary hook may be substituted where it isdesired to handle stone, timber or the like. Mounted on the platform 18is a hoisting engine 25. This hoisting engine is provided with drums 26and 27 and with nigger heads 28 and 29. In the present instance, I haveshown two drum hoisting engine, although it is obvious that varioustypes of engines, ranging from a single drum to any desired number ofdrums, may be employed. This hoisting engine not only operates thederrick, but is also used to shift the skids and to move the derrick onthe skids. Secured on the platform and projecting to the rear thereof,is a plurality of timbers 30, which timbers act as a base for the engineand are preferably floored over so as to provide a. platform for fueland other necessities to be carried with the derrick and the engine Thetimbers 30 joined together near their rear ends with a timber 31 and tothis timher are swingingly attached snatch blocks 40 and 41. Aroundthese snatch blocks pass cables 3% and 35. These cables ha e their ends36 and 37 secured to the timber 31. The cables are then passed forwardto the front end. of the skid where they pass around sheave wheels 38and 39. These sheave wheels are secured in advance of the front end ofthe skid and directly in front of the railslfi' so that the skid will bepulled straight backward. After passing around the wheels 33 and 89,-the cables 34 and pass around the snatch blocks 32 and ll as previouslystated. The cable 34 then passes around snatch block 40 and both cablesmay be then wrapped around the nigger heads. Secured near each end ,ofthe platform 18 are sockets 42 through which are inserted bars 43. Thesebars are provided near their outer ends with a screw threaded castingl4, through which a jack screw 45 screw in the sleeve. -The bars 4t3 maybe either permanently attached to the platform or may be removably"secured thereto. In the event that they are removably secured, it isonly necessary to have two sets of bars andjacks as they can be readilychanged block F0. This block is from side to side of the platform.l/Vhen is desired to move the skid, the bucket 24: is

' filled with material and partially raised as in Fig. 1. The boom isthen swung into the position indicated by dotted lines in Fig. 2. Thishas a tendency to relieve the weight on the skid 7. The engine is thenstarted and the cable 34 wound around the nigger head 29, and as thecable is pulled the skid 7 is moved, so that the front end of the skidwill be under the front wheel of the platform; The boom is then swung tothe opposite side, and the operation repeated on skid 6, by means of thecable 35.

In the event the load carried by the bucket. is not great enough torelieve sufficient weight on the skid to allow it to be moved underneaththe Wheels, the jack screws are brought into use. The plates 46 resteither on the ground or if thatis too soft, on'timhers. The tighteningof thesescrews will havea tendency to further lift up that sideof theplatform and release the weight on the. skid when it can readily bemoved. When it is desired to move the derrick backward on the skid, theskids having been previously moved so that the front end of the tierrick is adjacent the front end of .the skid, I employ a cable 48.

This cable has its one end secured in the frame 49 of the snatchpivotally attached to the front end of the platform 18. The cable 48is'then passed around a sheave wheel 51, then around the snatch block50.

r I From there it passes around a second sheave Wheel 52 then underneaththe timbers 30 and around the snatch block 53. The free end 54 beingadapted to be wrapped around one of the nigger heads so that by pullingthereon, the entire device will be rolled backward on the rails 16.During this opera.- tion the full weight of the machine or derrick restsdirectly on bothskids so that the derrick will move, but its weight willhold the skids against movement on the ground.

snatch blocks and having one of their ends platform and their other endssecured to the adapted to be'wrapped around the nigger heads for movingthe skids, 'ineans carried by the platform for relieving the weightalternately on each skid, so that they may be moved, form along theskids.

2. The combination with a derrick p,ro

vided, with a platform having'supporting wheels, a hoisting enginehaving hoisting drums and niggerheads, or a pair of skids provided trackrails on wh ichi said derrick nay nbe supported, a plurality of'blockscarried by said skids and platform, a plurality of cables mounted aroundsaid blocks and having one of their ends secured havesignedmy name tothis specification.

'enone i e. rnnnnnnerisr.

and means for moving the plat- V to. the platform and their other endsadapted to lief-wrapped of skids provided with longitudinally withlongitudinally extending

